Schwartz, Bernard
Hill and Wang, 1963
Buku Teks
McLaughlin, Andrew C.
Appleton Century Crofts, 1935
Buku Teks
Hockett, Homer Carey
Macmillan, 1939
Buku Teks
Wilson, Woodrow
Columbia University, [date of publication not identified]
Buku Teks
Miller, Walter B.
Office of Juvenile Justice and Delinguency Prevention, 2001
Buku Teks